Sleepy Ash

Sleepy Ash (スリーピーアッシュ) or Sloth (怠惰), and mostly referred as Kuro  (クロ) throughout the series, is the deuteragonist of Servamp. Kuro, named by his Eve, Mahiru Shirota, is the Servamp of Sloth. He is the oldest of the eight Servamps. When he is exposed to sunlight, he transforms into a black cat.

Appearance
If Kuro is not in his cat form, he has shoulder-length, blue hair with his front bangs reaching his eyes. His eye color is red and he has big, dark bags under them. They are always half-lidded and express a feeling of boredom. Just like any other vampire, he has pointed teeth.

Kuro mostly wears a blue jacket which is a tad darker than his hair color with the hood pulled over his head, the black fur looking close to the one of his cat form. He also has a patch on his left shoulder with the Roman numeral 1, probably because he is the oldest of the seven sins. He is wearing the bell Mahiru gave him as their contract symbol around his neck as sometimes seen in official illustrations, which is apart from that mostly hidden under his clothes. His blue jacket is often buttoned open, either a simple black or white shirt hiding under it. On both sides, Kuro has chest pockets. The hem of his jacket splits into many threads, starting short at the front but grow in length as they reach his back. His white pants are skin-tight and held up with a red belt, which is rarely seen. Kuro wears long, black boots that almost reach his knees.

Kuro is actually taller than he seems since he always walks around with a hunched posture and hands in his pockets.

As a cat, Kuro has black fur and red eyes. Around his neck he is wearing Mahiru's bell as a collar with red leather. His tail splits at its end into four, close to the threads at the back of his jacket in his human form.

Personality
Being the Servamp of Sloth, Kuro spends his time sleeping, lazing around or playing video games. He feels no shame in running away to avoid any trouble and refuses to take decisions for he doesn't want anything to be his fault, and he doesn't want to disappoint anyone. Kuro is a 'shut in' pacifist vampire, and rarely drinks Mahiru's blood, most of the time he refuses and drinks only when he is about to fight. He prefers staying at home rather than going out and seems to dislike the changes of temperature, according to him vampires are delicate to this.

Despite his lazy and at times comical nature (comical due to his laziness and arguments with Mahiru), he is shown to have a dark side. This is shown whenever anyone try to bring up his past that involves him killing the creator of Servamps. The mere mention of his past was enough to make Kuro who usually is nonchalant to become aggressive. He views himself as a monster, a fact that he dislikes, which caused him to refuse finding out more about his own race as it'll prove further how much of a monster he and his siblings are. He also refuse to turn any humans into vampires to make them his subclass, saying that they probably didn't want to become vampires, and that vampires shouldn't even exist.

Mahiru's straightforwardness and sincerity started to influence Kuro, though he always hides it by feigning uninterested and lazy as always. After Mahiru confronted him in his mind regarding his past action and assured him he is not alone, Kuro decides to stop running away and face his past, since then becoming more willing to fight and determines to stop Tsubaki.

History
Kuro is the first and oldest of the seven servamps. At one point in the past, he was approached by with the decision to kill a certain person, the creator of the servamps by the C3. He called his remaining siblings to a family meeting to discuss whether they should accept the request or not. The discussion became an argument so they decided to do a majority vote, with Kuro making the final decision. Believing that the experiment that their creator was doing was too dangerous and to prevent another "monsters" like them to be born, Kuro decided that they should kill their creator and he willingly volunteered to be the one to do it. This decision caused him to have a falling out with Lawless, straining their relationship for years.

As per request, Kuro went to Japan to do the job. Upon meeting his creator for the first time after years, Kuro was surprised at the fact that the information was true, having a hard time believing that his creator is still alive. Kuro started to waver, but then convinced himself that he needs to be killed because his research is too dangerous. After killing his creator, however, Kuro began questioning whether he did the right thing or not, and this uncertainty haunted him since then.

Contract with Mahiru
Kuro first met Mahiru when the latter found him lying helplessly on street and decided to take him in as a pet. Soon, Kuro revealed himself as a vampire to Mahiru, and since he has given him a bell and a name, he decided to stay at Mahiru's house, much to Mahiru's dismay. The next day, on their way home, they were attacked by Belkia. Although initially reluctant, Kuro fought Belkia and powered up by drinking Mahiru's blood, finalizing the contract between him and Mahiru, making him a servamp. He easily defeated Belkia and intended to kill him, but Mahiru stopped him by reminding him of his own words that whatever happens onward, he (Mahiru) will be the one who make the decision and take the responsibility for it. Relenting, Kuro spared Belkia who was then picked up by another vampire, Tsubaki.

First Encounter with Tsubaki
Tsubaki introduced himself as Kuro's youngest brother and the eighth servamp, the servamp of melancholy. However, Kuro doesn't recognise him as he never met him before and avoids fighting him, opting to run away. Tsubaki proceeds to attack Kuro, and despite the injuries, Kuro refuses to drink Mahiru's blood because he is too tired to fight back after using his strength against Belkia yesterday. They are saved by Servamp of Lust's interference, allowing them to escape.

Alliance with Misono and Lily
The next day, Kuro and Mahiru are taken by Misono Arisuin, the Eve of Servamp of Lust that saved them before, Snow Lily. They demands Mahiru to give Kuro to them to fight against Tsubaki. While Mahiru objects since Misono and Lily are using force, Kuro quickly surrenders, forcing them to run away. After Mahiru and Kuro protected two of Lily's subclass, they forms alliance with Misono and Lily. Misono then informs Mahiru that Kuro can give him a weapon to fight. When prompted by Mahiru, Kuro asks what does he need a weapon for. When Mahiru answers he wants it to protect himself and his friends, Kuro tells him to close his eyes as he materialize his weapon which is called "Lead", that takes a form of a broom. Kuro reminds Mahiru that when they first met, Mahiru attacked him with a mop and asks does he think that it equals a weapon, something that Mahiru denies.

Battle Against Sakuya and Belkia
Mahiru and Kuro are lured by Mahiru's close friend, Sakuya, who is revealed to be Tsubaki's subclass. Kuro and Mahiru are binds by Belkia's string, but Kuro able to free himself to shield Mahiru from Belkia's attack. When Mahiru calls out to him, Kuro tells Mahiru that it's useless for him to drink his blood now. He explains that servamps receives strength and motivation by drinking their eve's resolve flowing in their blood. Since Mahiru is unsure right now, even if he drinks his blood, it won't be enough to defeat both Belkia and Sakuya. When Mahiru decides to fight, Kuro tells Mahiru to retreat, sensing that Mahiru is unsure of himself which unnerved him. As Mahiru fought Sakuya, Mahiru's doubt and fear overflowed within Kuro, causing him to lose control of his power. Before he can absorb Mahiru, Kuro is stopped by Servamp of Envy, Jeje, changing back into his cat form.

Abilities
Transforming Servamp Bond Claws Speed and Flight Endurance Inner Power Jacket Tails
 * Kuro can change into a black cat and into his human form at will. He can also speak when he is in his cat form. But, when he is exposed to sunlight, he automatically reverts back to his cat form. It is later revealed that he can turn into a giant lion.
 * When he drinks Mahiru's blood, the chain connecting them is visible and he appears to become more powerful.
 * He can extend his nails into long, sharp black claws, easily able to cut and skewer people and other vampires.
 * He is shown to have incredible speed and can jump high very easily, also shown that he is able to fly -which is rather strange as he is a shut in vampire and doesn't move round much.
 * Since he is immortal, he can't die. But, he heals very quickly and he was still able to fight even when he was stabbed through with a sword and still stood protecting Mahiru when he was being slashed at back and forth by knives. He was also knocked out by being shot at in the back by Envy's barrel guns.
 * When his control of his power was gone, he was much more faster, powerful, and ruthless; also unaware of what he is doing. He was shown beating Berukia, one of Tsubaki's servants, mercilessly. He grabbed Berukia's hair and was about to bite off his neck to kill him, revealing a new set of long, sharp canines, and he would have too if Mahiru hadn't stopped him by pulling on the chain around his neck and Envy knocking him out with his gun. He even hurt Mahiru in the process; grabbing his face with his claws, leaving three thick scratch marks above his right eye, and roughly biting him down on his neck.
 * He can move and use the tails at the end of his jacket to fight.

Mahiru Shirota (Eve)
For hundreds of years Kuro didn't have an Eve until Mahiru picked him up thus making them partners. Kuro initially only sticking around Mahiru due the contract made between them, and whenever he does something, mostly it was because Mahiru forced him to do it. Both often get into argument due to their contradicting personalities. Slowly, however, Mahiru's determination and sincerity started to influence him. Despite continuously saying that it's troublesome or he can't face it, he always protects Mahiru. He was often baffled by Mahiru's straightforwardness and willingness to trust him that he usually hides by feigning lazy, while in reality he is actually happy. Even though not shown clearly, Kuro grow to care for Mahiru and doesn't want to lose his trust. Their bond improved further after Mahiru helped him confront his past mistake and for the first time he tells Mahiru directly they are partners.

Lawless
Out of all his siblings, Kuro has a bad relationship with Lawless. Their hostility for one another originated when Kuro decided to kill their creator, something that Lawless strongly opposed. Unable to accept Kuro's action, Lawless told him that he will never forgive him, which continues for years. Whenever they met, Lawless always mocks and satirised his past action, which enough to make Kuro who usually prefers to be quiet to attack Lawless without any hesitation and shows clearly his murderous intent. After Kuro decided to face his past mistake, Kuro also apologized to Lawless regarding the incident by thanking him for not forgiving him back then, which Lawless accepts. Since then, the two spent their times together more often and it's also revealed that both were quite in common, both often likes to annoy Mahiru with their antics in particular.

C3
Kuro is shown to have a strong hatred for C3, the neutral group, due to the request given to him to kill his creator. Any conversation regarding C3 always makes Kuro uneasy, even yelling at Mahiru when he suggested if they could get C3's help. Since the incident, he decides to avoid any involvement with C3. Later on, when Kuro and Mahiru were captured by C3, and were escaping, Kuro's inner demon that controls his power was taunting him by saying that C3 brings back bad memories and that they should trash something up since they both still really hate C3. After C3 saved him and the others from Tsubaki and watches over them since then, Kuro decides to temporarily work with C3 to make sure they won't do as they please.

Tsubaki
Tsubaki seems to bear one-sided hatred Kuro for not knowing him being his youngest brother like his other siblings, mercilessly attacking him during their first encounter. Tsubaki actually has been looking for Kuro ever since he saw his lion form after he killed their creator, but didn't know it was him until Kuro showed up with that form together with Mahiru to rescue Lawless. Kuro initially didn't pay much attention towards Tsubaki and didn't really accept him as his youngest brother since he never heard of him. This changed after Tsubaki destroyed Lawless' contract item and revealed that he witnessed Kuro killing their creator, forcing Kuro to believe that Tsubaki is truly a servamp. Coming into conclusion that Tsubaki's goal is to get revenge on him and his other siblings due to what happened with their creator, Kuro feels responsible and determines to stop and properly speak with Tsubaki to understand him, not wanting to repeat the same mistake he once done.

Quotes

 * "Ahhh...Now you're happy. Silly cat...Mahiru made you feel good...Right? But C3 brings back bad memories. If Mahiru discovers the 'Incident'...Will he still trust you? Are you worried? Mahiru's still a rookie...Happy birthday! You contradict yourself. You keep it all inside. You poor, pathetic boy! While we're at C3...Wanna trash something? After all, we still really hate them! Am I right?" (Kuro's inner demon taunting Kuro.)
 * "What you call simple, I call nagging." (to Mahiru.)
 * "Cat abuser." (to Mahiru)
 * "Paranoia's not my thing...Unlike you. Why look for trouble?"  (to Mahiru)
 * "Look at me guys...My cuteness will calm you..." (to the arguing Misono and Mahiru)
 * "Are you ever sorry...you found me...?" (to Mahiru)
 * "The pain! Wish I could die...But I can't." (Kuro complaining after escaping Tsubaki)
 * "Well, that's that! You are my master." (to Mahiru after drinking his blood, completing the contract)
 * "You'll...be the death of me." (to Mahiru after being stabbed to protect Mahiru)
 * "You are such a pain..." (to Mahiru)
 * "Close that! I hate sunlight..." (to Mahiru)
 * "I'm just your friendly neighborhood vampire." (to Mahiru)
 * "Humans are soo cruel...Meanie!" (to Mahiru)
 * "But the sun will kill me! Okay, I'm immortal. But still! Meeow!" (to Mahiru)
 * "We mix like oil and water." (to Mahiru)
 * "Reeeowr! Shame on you! Sucking up your cute little pet!" (Kuro complaining after Mahiru used the vacuum on him)
 * "Vampires don't age...Plus, I have a baby face." (Kuro to Mahiru)
 * "She hit me with a broom..." (Kuro to Mahiru after taking out the trash)
 * "Owww! The agony! An apple juice might help! Or a cola..." (to Mahiru)
 * "You read too much manga." (to Mahiru)
 * "Yes mommy..." (Kuro teasing Mahiru)
 * "Me want ramen! Yumm..." (to Mahiru)
 * "I follow your sign. If cancer gets bad news, I wanna know. And protect myself!" (to Mahiru)
 * "You always give one hundred and ten percent...that's way too much. Sit down." (to Mahiru who kept helping everyone who needed it)
 * "And never force  him(Mahiru) to do that again." (Kuro threatening the C3 employees after Mahiru had to use a dangerous amount of power to break out, causing Mahiru harm in the process)
 * "Where's Mahiru?" (Kuro to the C3 employees, mad that he was apart from Mahiru, putting Mahiru in danger)
 * "Housewife." (Kuro teasing Mahiru)
 * "Aww...It's okay. I just say, 'He told me to do it.' Free will is overrated." (to one of Berukia about Mahiru)
 * "Mahiru...do you trust me?" (to Mahiru)
 * "I have...lots...of them. But...I...can't tell you. Some things you shouldn't know. Some things...could kill you." (to Mahiru after he asked if he had anymore secrets)

Trivia

 * "Kuro" (クロ) literally translates into "black", Mahiru named him so due to his black fur when he is in cat form.
 * His favorite food is instant ramen and potato chips (with bouillon flavor).
 * His favorite ice cream flavor is cookies and cream.
 * He dislikes the sound of the alarm clock and the vacuum cleaner.
 * His hobbies are playing video games and looking for a comfortable pillow.
 * His favorite color is black.
 * In official illustrations Kuro is often drawn in both his cat and human form.
 * His catch phrase is 「めんどくせー」 (mendokuse) which roughly translates into "what a pain".
 * He hates vanilla ice cream.
 * He claims to dislike drinking blood from Mahiru.
 * Kuro becomes happy whenever Mahiru calls them partners.
 * In his cat form, a lot of girls at Mahiru's school find him adorable and sometimes dress him up in girly outfits.
 * Whenever Kuro really has to drink Mahiru's blood, he mostly does it in his cat form and bites him on the arm or leg, never his neck. The only time he drink from his neck is when Kuro lost control during the fight against Sakuya.
 * Kuro rarely drinks blood, and when offered, he rejects the idea or makes an excuse, preferring to eat junk food instead; the reason is not yet known.
 * In Drama CD, Licht took a liking to Kuro when he first saw him in his cat form. This continues even after knowing he's actually a vampire, most likely because Kuro is quiet as oppose to Hyde.
 * He has a patch on his left shoulder with the Roman numeral 1, probably because he is the oldest of the seven deadly sins; Snow Lily also has a patch on his left shoulder with the Roman numeral 7, and on the fifth volume cover Lawless had a patch with the numeral for 5.
 * In the first popularity poll he came first with 7145 votes.